DRP uses bulk electrical resistivity for a variety of purposes relevant to assessing the quality and durability of cementitious materials. Bulk resistivity measurements are the foundation of the Formation Factor, which provides a robust method to evaluate the potential durability of a concrete mixture. The Formation Factor is a central pillar in determining transport properties of concrete mixtures and developing service life models of the time to reach chloride corrosion thresholds for embedded steel reinforcement. Finally, we use bulk resistivity with residual expansion testing and quantitative microcracking measurements to the potential for damage to occur in concrete affected by alkali-aggregate reaction.
With custom plates we can measure bulk resistivity in cores that are up to 150 mm (6 in.) in diameter.
Electrical resistivity shows variations consistent with w/cm
Electrical resistivity in fly ash mixes increases with time, consistent with the refinement of the microstructure with the progression of hydration.
We use bulk electrical resistivity to explore the effects of residual expansion in concrete that has an alkali-aggregate reaction.